K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2019-10-02T15:45:49.065269Z
K 7
svn:log
V 576
Disallow fcntl(F_READAHEAD) when the vnode is not a regular file.

The mountpoint may not have defined an iosize parameter, so an attempt
to configure readahead on a device file can lead to a divide-by-zero
crash.

The sequential heuristic is not applied to I/O to or from device files,
and posix_fadvise(2) returns an error when v_type != VREG, so perform
the same check here.

Reported by:	syzbot+e4b682208761aa5bc53a@syzkaller.appspotmail.com
Reviewed by:	kib
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D21864

END